Cosmo Beauties of the Week, 1/4/13

Hollywood's hottest rang in 2013 with some of the most smoking hot looks we've seen all year. From brown eye liner (seriously?) to a pert bob, check out how these A-listers reinvent sexy with surprising hair and makeup choices.

Karlie Kloss

Karlie Kloss

At a Target holiday event, the supermodel demonstrated how to sex up a standard bob. You pair tousled, slightly tangled bed-head curls with a thin flick of liquid liner, and go! The unstudied sexiness if it all will drive him insane.